Location: Crop Genetics and Breeding ResearchTitle: Influence of temperature on susceptibility of cvs. Tifguard and Georgia-06G peanut to Meloidogyne arenaria
|YUAN, WEIMIN - University Of Florida|
|Holbrook, Carl - Corley|
|CHU, Y - University Of Georgia|
|OZIAS-AKINS, P - University Of Georgia|
|DICKSON, D - University Of Florida|
Submitted to: Journal of Nematology
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: 10/15/2018
Publication Date: 12/1/2018
Citation: Yuan, W., Holbrook Jr, C.C., Chu, Y., Ozias-Akins, P., Dickson, D.W. 2018. Influence of temperature on susceptibility of cvs. Tifguard and Georgia-06G peanut to Meloidogyne arenaria. Journal of Nematology. 50:33-40.
Interpretive Summary: Tifguard is a peanut cultivar with a high level of resistance to the peanut root-knot nematode. High soil temperatures have been shown to reduce the effectiveness of nematode resistant genes in several crops. There have been no studies on how soil temperature affects the nematode resistant gene in peanut. Our objective was to determine the role of soil temperature on infection and development of root-knot nematode in Tifguard compared to that in the nematode susceptible cultivar, Georgia-06G. The high level of nematode resistance in Tifguard was confirmed in three soil temperatures (28C, 31C, and 34C). It is unlikely that high soil temperatures would lessen the effectiveness of the nematode resistance gene in peanut.
Technical Abstract: Tifguard was released in 2008 as a peanut cultivar with a high level of resistance to Meloidogyne arenaria. Our objective was to determine the role of temperature on infection and development of M. arenaria in Tifguard compared to that in the nematode susceptible cultivar, Georgia-06G. Temperature affected the rate of nematode infection and development in both Tifguard and Georgia-06G (P < 0.05). In Georgia-06G, egg-laying females were observed 25, 20 or 25 days after inoculation at 28C, 31C, and 34C, respectively. There were greater numbers of nematodes entering roots and acceleration of development in response to 31C compared with that at 28C. There was, however, a decrease in the number of nematods entering roots and their development was retarded at 34C compared with that occurring at 31C. Although second-stage juveniles penetrated Tifguard roots, they did not develop further at 28C or 31C; however, at 34C both females, males, and a few egg-laying females of M. arenaria were observed. The optimum temperature for nematode infection and development was 31C in Georgia-06G. In summary, it is unlikely that high soil temperature would lessen the effectiveness of the nematode resistance gene in Tifguard.